Homes with in law suites — San Mateo, CA
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.
About this service
A home with an in-law suite includes a private living space, usually with its own entrance, kitchen, and bathroom, designed to house extended family members. People seek these properties to keep aging parents or adult children close while maintaining boundaries and privacy. If your current home doesn't have one, adding an ADU can achieve the same result. Exact pricing confirmed free on the call.
Frequently asked in San Mateo
Can you recommend an accessory dwelling unit contractor in San Diego?
Can I find an accessory dwelling unit for rent in San Mateo?
While we focus on construction, many San Mateo homeowners build ADUs to rent out. You can explore local rental listings or property management sites for available units. Creating your own ADU provides a new rental opportunity. We can help you build that valuable space for your property.
What is the accessory dwelling unit cost in San Mateo?
The accessory dwelling unit cost in San Mateo varies by size, design, and materials. Site conditions and any necessary utility upgrades also impact the final price. We provide a precise, no-obligation quote after a thorough assessment of your property. This ensures you have a clear understanding of the project's investment.
Where can I find accessory dwelling unit builders near me?
Can you tell me about accessory dwelling unit construction?
Accessory dwelling unit construction involves building a secondary housing unit on your property. This includes site preparation, foundation work, framing, and interior finishing. It requires adherence to local building codes and permits. Our partnered professionals manage the entire construction process efficiently. Let us guide your project in San Mateo.
What is the accessory dwelling unit cost in San Mateo?
The accessory dwelling unit cost in San Mateo is influenced by its size, design complexity, and chosen materials. Site preparation and potential utility hookups also affect the total investment. We offer a free, personalized quote after evaluating your property. This ensures you have a clear understanding of the project's cost.
What accessory dwelling unit services are available in San Mateo?
Also serving nearby: Hayward · Daly City · Oakland · Sunnyvale · Fremont
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of San Mateo — population 101,327; about 8,350 residents per square mile across 12.1 sq mi. ZIP codes covered include 94401, 94402, 94403, 94404, 94497.
Neighborhoods served in San Mateo: Aragon, Bay Meadows, East San Mateo, Laurel Creek, Parkside — and every surrounding area.
Areas we serve
Browse by state, then city.
California (4)
All of California · Rialto · San Buenaventura (Ventura) · San Mateo · Vacaville